I won't get into too many details, but 4x4s are slightly stronger than doubled 2x4s (the degree of difference depends upon the method of fastening), however they are a fair amount less costly and are far stronger than required for the task at hand.I used 4x4 posts for the legs of my bench -- I suppose two 2x4's woulda been just as fine.
I'm not trying to be an ass but just offering constructive criticism.She is still a work in progress. For instance, I will be redoing the peg board and installing a hard wired outlet hub (6 outlets) so I can keep the wires running to the back of the bench. As it stands now, the plan is to eventually top the OSB with a smooth counter surface and install a vise on the corner as well as install some shelves above the peg board. Also going to hang another shop lamp up above and install a ceiling mount double outlet.
I see a Hornady LnL AP Progressive, Hornady Auto Charge, a Thumler Model B, and 6 cans of One Shot.Hey, $75 is 1000 bullets. Certain choices have to be made at times. Sometimes aesthetics have to come in second.